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Downer this afternoon said the Milford Road (SH94) would close overnight from Hollyford road junction to the chasm. Snow was forecast down to 700m.

The road was likely to reopen by 10am tomorrow, but ''significant snow'' was forecast down to low level on Thursday (40cm-60cm expected in the Homer Tunnel area), which could mean an all-day closure. Snow was also forecast for Saturday.

The chilly blast was also forecast to bring snow down to 400m in the south of the South Island, and many alpine roads were subject to road snow warnings through to tonight including Arthur's Pass (SH73), Lindis Pass (SH8), Crown Range road, and Dunedin's Northern Motorway (SH1).

Flooding in Otago, Southland

The New Zealand Transport Agency has issued two flooding warnings for inland Otago. Road users are asked to take care and drive to the conditions.

Southern District Police said there was reported flooding in various locations on State Highway 6 between Cromwell and Makarora this afternoon.